Plug for oil wells



INVENTOR ATTORNEYS 1 1'92 l Aug 6, 7 w. c. cusHlNG PLUG FOR OIL WELLSFiled March 6. 1926 WITNESSES @M #lawful/9' (5 ,'SLF

Petemed Aug. 16, y'1927.

PATENr OFFICE.

mum c. cusnme, or Barsrow, oxnanona' PLUG non om WELLS. l

' Application led Iarch 6, 1,928. Serial No. 92,907.

ThisA vinvention relates to plugs for `oil wells.'v

Wens ,ef smaller type which ere. drilledin shallow sands are sunk to thelower sands '10 upper sands is'to be recovered. It is usual in suchcases to attempt to plug the well by means Aof lead wool, orle'ad orwood of various types.' However, these materials fail to. stop the flowdue to the fact that the -15 materials do not adhere suiliciently to thesides of the well and thereby beretained in `place for stopping the ilowof water.

' It is an object of the present invention `to provide a plug havin arubber element 20"wl1ich when compresse will ri 'dly adhere to the wallof the well so that t e rubber is supported in lace and will thusprevent further ilow o the water.

A. further object of the invention is the p ,25' revision of a tolhaving a sliding mandrel ger compressing a rubber gasket between and thebody of the plug so that the mandrel the rubber is forced. outwardly andcompressed rigidly against the walls of the well. 30 This inventionwillbe best understood from a consideration of the following detaileddescription, in view ofthe accompanying drawings forming a part of thespecification; nevertheless it is to be underthe disclosure, beingsusceptible of such changes and modifications which shall deinenomaterial departure from the salientA features of the invention asexpressed in the apended claims.

'In the drawings: Figure 1 is a view in elevation of a plug shown inposition in an oil well. Figure 2 is a vertical section of the tool.

Fi re 31s a'vertical section of the tool showing the rubber gasketcompressed.

Figure4 is a'transverse horizontal section vvtaken along the line 4--4rof Figure 1.

Referring more particularly to the 'drawings, desi ates an oil wellin-wluch is dis osed a p ug constructed in accordance wit*V theprinciples of my invention. The plugl comprises a 'mandrelll having aperforationA 12 in whch is adapted to be inserted the end of a '.virefor lowering the plug Ainto. the. well.l This wire is adapted stood thatthe invention is not confined to 2 to be removed as soon asvthe plug isQin position. 'lhe mandrel has a centrallv disposed cylindrical member13 projecting downwardly and into a; hollow body 14.k

- The mandrel has an annular collar-'15y provided with a bevelled face16. The up per end of the body member 14 is provided with an annular'oove 17 adapted to receive the lower 'end o a rubber gasket 18.

The upper end of the gasket is sheared olf to conform to the4inclination. of the face 16v of the collar 15 so that the upper end o'fthe gasket will be neatly received by said collar.

.A pin 19 passes through the diametrically disposed perforations intheupper end 0f the body member 14 and through a passage in the centrallydisposed member 13 of the mandrel. The hollow bore 20 of the body member14 is provided with a tapered upper end 21 in which is adapted to'beseated a plurality o'f slips 22. These slips are tapered as shown at 23,to conform to the tapering of the upper end of the bore.- The slipsare4 rovided ,with teeth 24 adapted to engage the elongated bar 13,

A spring. 25 has lits upper end in engagement wlth the lower end of thesleeves 22 while its lower end is seated upon the 'inner end 26 of aplug 27 which is screwed into the lower threaded end of the body orbarrel 14. i

' The plugmis provided with a recess 28 adapted to engaged by somesuitable tool for turning the plug since the lug is rounded on itsexterior surface as s own at A drilling bit is shown in engagement. withthe upper end of thepmandrel 11. A plug is lowered into the well byconnecting the plug to a bailer by means of a wire through the aage 12'.When the plug is in position t e wire is snapped free from the bailerand the bailer is removed from the well. The tool is lowered into thewell and driven down upon the top of the mandrel 11 with suicient forceto compress the rubbep` gasket 18 as shown in Figure 3 and with s'ucient force to cause the pin 19 ,to be sheared olf within the bar 13 andcarried downwardl into a recess 32 within the plug 27 VThe rubber gasketis compressed lengthwise and thereby forced outwardl an in rigidengagement with the walls o the well and the slips 22 hold the rod 13against rel los rubber from the mandrel so that the mandrel may bedriven deeper which will cause further expansion of the rubber and whichmay be cut from the plug by the spud, The mandrel maythen be drivenfurther into the body member 14 which will cause the rubber gasket to beremoved entirely from the plug. After this has happened the plug may beremoved by employing a fishing tool to engage the threaded portion 33 ofthe mandrel 11. The plug may be fished out by any standard combinationsocket in the ordinar manner.

lVhat I claim is:

A plug for oil wells comprising a mandrel having a collar and acylindrical bar projecting from the collar, the inner face of the collarbeing concaved, a body having a central bore adapted to receive the barand provided with an annular seat at the inner end thereof, a pinconnecting the inner end ofc the body member thr'ou h the inner end ofthe bar, said pin adapte to be sheared when they bar is driven into the`hollow body, a y

rubber gasket embracing the bar and having one end seated in engagementwith the concaved face of the collar, the other end of the I the hollowportion of the body member at its inner end being provided withapconical face, slips engaging the bar and having inclined faces inengagement with the conical face of the hollow body, a plug screwed intothe outer end of the body and providedy with an inner shoulder, a springengaged at one end by the shoulder, the other end of the spring being inengagement with the ends of the sllps, sald plug having a recess adaptedto receive the free end of the bar of the mandrel when the mandrel isdriven into the body member, with the bar moving into the recess in theplug whereby therubber gasket is compressed and expanded laterally ofthemandrel. 4

, L .WILLIAM C. CUSHING.

